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                狼和羊                </h1>
                <p>时间限制：40s&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;  空间限制：512MB</p>			</div>
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                                <h3>题目描述</h3><p><div>B 村庄的牧群遭到危险！狼群正在袭击了一个牧场的羊。牧场的主人 John 决定消灭所有的</div>
<div>狼而不伤到任何一只羊。于是他拿起了祖父留给他的步枪，冲向大屠杀。这支抢装有穿甲弹，因</div>
<div>此，可以消灭一条直线上的任何动物，包括羊。John 站在原点 (0, 0)，于是每次射击为从原点出</div>
<div>发的一条射线。如果这条射线和一个动物相交，那么这个动物就被射死。你的任务是帮 John 找</div>
<div>到最少射击次数，使得能够消灭所有狼而不伤到羊。</div>
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<div></div>
<p></p></p><hr/><h3>输入格式</h3><p><div>第一行为 n,m分别代表狼和羊的数目。接下来n+m行，每行四个整数 x1,y1,x2,y2 用一</div>
<div>条线段 (x1,y1) &nbsp; (x2,y2) 来描述一个动物。前 n行描述的是狼，后m行描述的是羊。</div>
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<div></div>
<p></p></p><hr/><h3>输出格式</h3><p><div>如果可以消灭所有狼而不伤到羊，输出最少射击次数。否则，输出&rdquo;No solution&rdquo;（不含引</div>
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<div>号）。</div>
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<div></div>
<p></p></p><hr/><h3>样例输入</h3><pre>2 1
1 1 2 3
-5 4 2 2
999 1000 1000 999</pre><hr/><h3>样例输出</h3><pre>1</pre><hr/><h3>提示</h3><p><div>对于 100% 的数据，0 &lt;= n,m&lt;= 10^5; 1000 &lt;= x1,x2,y1,y2 &lt;= 1000，注意线段之间可能相交，</div>
<div>线段也可经过原点（该动物会被任何一次射击杀死）。</div>
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<p></p></p><hr/><h3>题目来源</h3><p>没有写明来源</p>
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